<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>类式组件</title>
  </head>
  <body>
    <div id="test"></div>
    <script
      src="https://unpkg.com/react@16/umd/react.production.min.js"
      crossorigin
    ></script>
    <script
      src="https://unpkg.com/react-dom@16/umd/react-dom.production.min.js"
      crossorigin
    ></script>

    <script src="https://unpkg.com/babel-standalone@6/babel.min.js"></script>

    <script type="text/babel">
      class Mycomp extends React.Component {
        render() {
          //render是放在哪里的?   ===  Mycomp 的原型对象上,供实例使用
          //render中this指的是谁? ===  Mycomp 的实例对象  Mycomp组件实例对象
          console.log(this);
          return <h2>我是用类定义的组件(适用与[复杂组件]的定义)</h2>;
        }
      }

      ReactDOM.render(<Mycomp />, document.getElementById("test"));
    </script>
  </body>
</html>
